[texworks] error in image display

[Benny Lautrup]

Hi Bruno,

Thanks for taking all that trouble in trying to solve the problem.

I just tried out your modified file in r571, and it works perfectly. So you
must be right in your analysis, that it is the missing fonts that make
trouble. What I do not understand, however, is that up to version r511
everything was ok, but already in r514 (the MikTeX version), it goes wrong.
Something must have happened in between.

--Benny

-----Original Message-----
From: texworks-bounces at tug.org [mailto:texworks-bounces at tug.org] On Behalf
Of Bruno Voisin
Sent: 27. februar 2010 12:28
To: Discuss the TeXworks front end.
Subject: Re: [texworks] error in image display

Le 27 févr. 2010 à 10:45, Benny Lautrup a écrit :

> Thanks for the comments. Neither do I dare to enter into the patching 
> business right now.

For the moment a way to circumvent the problem would be to pre-process your
PDF files to make sure all fonts are embedded in them already.

A free solution comes through epspdf <http://tex.aanhet.net/epspdf/>. Says
section 3.2 of the manual <http://tex.aanhet.net/epspdf/epspdf.pdf>:

"When converting to pdf, Ghostscript handles font embedding differently
depending on the “Target use” option. For prepress, it embeds even the
standard fonts, including Times etc. Ghostscript has copies of these fonts
in case the PostScript file doesn’t have them. For screen, it doesn’t embed
standard fonts.
You can embed fonts after the fact by converting pdf to eps or ps, and back
to pdf, with target use set to “prepress”. However, don’t try this unless
you have pdftops."

You need three things:

- xpdf (only the tools part -- pdftops, pdffonts and the like -- of its
distribution is required, not the PDF viewer xpdf itself), for the
conversion from PDF to EPS. There are precompiled Win32 binaries of the
tools at <http://www.foolabs.com/xpdf/download.html>.

- Ghostscript <http://pages.cs.wisc.edu/~ghost/>, for the conversion from
EPS to PDF. I think MikTeX installs it already.

- epspdf, for managing the conversions. I don't remember what was said
exactly on it being part of MikTeX or not. It's definitely part of TeX Live.

The epspdf site contains detailed instruction installations and URLs for all
of them, for all three platforms (Windows, Linux and Mac).

Here's how things go:

- Your original file. Mathematica1 is embedded but not subset (all
characters of the fonts are included, not only the characters used),
Times-Roman is not embedded:

$ pdffonts boundary-blasiusstreamlines.pdf 
name                                 type              emb sub uni object ID
------------------------------------ ----------------- --- --- --- ---------
Mathematica1                         Type 1            yes no  no       8  0
Times-Roman                          Type 1            no  no  no       9  0

- The conversion, in two steps: from PDF to EPS, then from EPS back to PDF
with "prepress" target:

$ epspdf boundary-blasiusstreamlines.pdf boundary-temp.eps $ epspdf
--target=prepress boundary-temp.eps boundary-prepress.pdf

- The resulting file has both Mathematica1 and Times-Roman embedded and
subset, and in addition is smaller:

$ pdffonts boundary-prepress.pdf
name                                 type              emb sub uni object ID
------------------------------------ ----------------- --- --- --- ---------
QUYNIS+Mathematica1                  Type 1C           yes yes no       8  0
GCONTZ+Times-Roman                   Type 1C           yes yes no      10  0

This file is included. You may try whether including it in your LaTeX
document, instead of the original file, solves the problem with preview
using TeXworks r371.

Hope this helps,

Bruno


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